If your XO is running a Release from 2008 or later, there is a Help activity for it. If it is installed on your XO, it will appear in your Home view with a (?) icon. You can install this activity from Activities/Help-G1G1 or using Software update in the Sugar Control Panel.
You can read a version of the same manual at http://laptop.org/manual The updated version of this Getting Started Guide is included, and you can use the menu on the left side of the manual page to jump directly to it if you wish.